08-06-2012
grep particular characters help
Hello folks i have file which is below, i want to extract last column of file that contains dm-21 or dm-13 or dm-N
Quote:
Aug 5 04:15:32 server kernel: ournald(4108): WRITE block 15661624 on dm-21
Aug 5 07:20:15 server kernel: <7(4108): WRITE block 315165328 on dm-21
Aug 5 07:20:15 server kernel: ck 315168240 on dm-21
Aug 5 07:20:15 server kernel: <d(4108): WRITE block 12050472 on dm-21
Aug 5 07:20:15 server kernel: d(4108): WRITE block 12050480 on dm-21
Aug 5 07:20:15 server kernel: <74108): WRITE block 12050504 on dm-21
Aug 5 07:20:15 server kernel: 8): WRITE block 316000544 on8): WRITE block 31600058): WRITE b8): WRITE bloc
k 316000568 on dm-21
Aug 5 07:20:15 server kernel: <8): WRITE block 316006424 on dm-21
Aug 5 07:20:15 server kernel: 8): WRITE block 316006432 on dm-21
Aug 5 07:20:15 server kernel: <74108): WRITE block 3160404108): WRITE block 316045440 4108): WRITE urnald(
4108): WRITE block 316049760 on dm-21
Aug 5 07:45:14 server kernel: <7E block 314216256 on dm-14
Aug 5 07:45:14 server kernel: <7E block 314216264 on dm-21E block 314216272 on dm-21
Aug 5 07:45:14 server kernel: E block 314216512 on dm-21
Aug 5 07:45:14 server kernel: <E block 314216576 on dm-21
Aug 5 07:45:14 server kernel: <E block 314216624 on dmE block 314216632 on dm-21
Aug 5 07:45:14 server kernel: <7(4108): WRITE block 314307720 on dm-18
it show output like
I have tried but i got this
Quote:
command
perl -lane 'print $F[-1]' /var/log/messages |grep -e "dm-*" > dm
Quote:
output
dm-4
dm-5
<dm-8
dm-8
<dm-8dm-8
dm-8dm-8
dm-9
<dm-dm-17
<dmdm-17
dm-dm-21
<dm-dm-8
dm-dm-8
Last edited by learnbash; 08-06-2012 at 12:09 PM..
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GLOB(7) BSD Miscellaneous Information Manual GLOB(7)
NAME
glob -- shell-style pattern matching
DESCRIPTION
Globbing characters (wildcards) are special characters used to perform pattern matching of pathnames and command arguments in the csh(1),
ksh(1), and sh(1) shells as well as the C library functions fnmatch(3) and glob(3). A glob pattern is a word containing one or more unquoted
'?' or '*' characters, or ``[..]'' sequences.
Globs should not be confused with the more powerful regular expressions used by programs such as grep(1). While there is some overlap in the
special characters used in regular expressions and globs, their meaning is different.
The pattern elements have the following meaning:
? Matches any single character.
* Matches any sequence of zero or more characters.
[..] Matches any of the characters inside the brackets. Ranges of characters can be specified by separating two characters by a '-' (e.g.
``[a0-9]'' matches the letter 'a' or any digit). In order to represent itself, a '-' must either be quoted or the first or last
character in the character list. Similarly, a ']' must be quoted or the first character in the list if it is to represent itself
instead of the end of the list. Also, a '!' appearing at the start of the list has special meaning (see below), so to represent
itself it must be quoted or appear later in the list.
Within a bracket expression, the name of a character class enclosed in '[:' and ':]' stands for the list of all characters belonging
to that class. Supported character classes:
alnum cntrl lower space
alpha digit print upper
blank graph punct xdigit
These match characters using the macros specified in ctype(3). A character class may not be used as an endpoint of a range.
[!..] Like [..], except it matches any character not inside the brackets.
Matches the character following it verbatim. This is useful to quote the special characters '?', '*', '[', and '' such that they
lose their special meaning. For example, the pattern ``\*[x]?'' matches the string ``*[x]?''.
Note that when matching a pathname, the path separator '/', is not matched by a '?', or '*', character or by a ``[..]'' sequence. Thus,
/usr/*/*/X11 would match /usr/X11R6/lib/X11 and /usr/X11R6/include/X11 while /usr/*/X11 would not match either. Likewise, /usr/*/bin would
match /usr/local/bin but not /usr/bin.
SEE ALSO
fnmatch(3), glob(3), re_format(7)
HISTORY
In early versions of UNIX, the shell did not do pattern expansion itself. A dedicated program, /etc/glob, was used to perform the expansion
and pass the results to a command. In Version 7 AT&T UNIX, with the introduction of the Bourne shell, this functionality was incorporated
into the shell itself.
BSD
November 30, 2010 BSD